Grinding machine



C. MUNTHE.

. GRlNnmG MACHINE. APPLICATION yFILED'MARl 2|, 1922.

1,431,024a Patented Oct. 3, 1922.

4 SHEETS-SHEET l.

y A km@ MKM C. MUNTHE.

GRINDING M ACHIN.

APPLICATION FILED MAR. 2|. 1922.

1,481,024, Patented Oct. 3, 1922.

4 SHEETS-SHEET 2.

C. MUNTHE.

GRINplNG MACHINE. APPLICATION FILED MAR. 2|. 1922.

.Patented 001;. 3, 19212.

4 SHEETS-SHEET 3.'

C. MUNTHE.

GRIND'ING MACHINE.

APPLICATION FILED IIIAR.2I, m22.

1,431,02@ Patented Oct. 3, 1922.

hay a2 //7 Ver? for roscillatingmovement.

'of Fig. 2;

Patented oei.. a, 1922. i

1,431,024 meTETort 1 La w ciimstrorrmt incurran, or niissnnncnnoenmmssnnGERMANY.

GRirNmt/TG MACHrNn.

` "Application inea Marcil ai, i922. serial No. 545,497.

To all wim/mt may concern,.- f

Be it known that l, CHmstroFrni-z MUNTi-m, a citizen of the Republic ofGermany, and a resident ot Dusseldorf-Oberkassel, Germany, have inventedcertainnew and useful lmprovements in Grinding Machines; (tiled inGermany January 29, 1921) and I do hereby declare the `following to be afull, clear, and exact description of the invention.

The present invention relates to a grind ing device for drills, cuttingsteels and other cutting tools, in which the work-piece remainsstationary while the grinding-disc `is executing an oscillatorymovement. The characteristic feature ot the invention is to be seen inthat the grinding disc is bearing in two swinging or rocking members insuch a manner, that one of the swinging membersis carrying the grindingv,spindle and its actuating device, while the other yswinging memberimparts `to they grinding kspindle an rIn the drawings Vseveral modes ofeXecuk tion of the invention "are illustrated, in which- F ig. lrepresents a vertical section "through the machine along line A-'-B inFig. 2; y Fig. 2 is an approximately horiz'ontal sec- I'tion along lineC-D of Fig. 3; 4 y

Fig. 3 is a vertical section along line lil- F Fig. L is `a diagram; yFig. 5 is a perspective view 'of another mode olf execution, in which'the table for hollow grinding is swung out ot working position;

Fig. 6 is a perspective `view` with the holder for hollow grinding inworking position; i Fig. 7 is a longitudinalsection through the devicefor hollow grinding;

Fig. 8 shows the tilting of the table for hollow grinding opposite theprofile disc; and

Fig. 9 shows on an enlarged scale the dividing head.

The trame lcarries on a driving shaft 2 a rocking member 3 which isrotatable and capable of being shifted in a longitudinal direction, andwhich again carries in bearings 4 the grinding spindle 5` and the segment grinding disc 6 and pulley 7,. The latter is driven directly by thelower pulley S while the pulley 9 is actuating the whole machine. TheliXed pulley 8 is of such width so as to allow the belt T1 to travelalong (Fig. l) if the rocking member 3 is shifted in longitudinaldirection.'

A sleeve l() attached to the rocking member 3 surrounds the grindingspindle 5 and runs in an eccentrical boring ofthe sleeve ll, which isjournaled in "a horizontal rocking member l2and driven by means of theworm-wheel 13, worm la, shaft l5, wormwheel 1'6 `and worm l? ig.rlhrough the turning motion of the sleeve ll the rocking member 3together with `the grinding disc `is oscillated in a horizontaldirection7 while the rocking 1ne'i`nber12 is swinging either in anupward or downward direction.

`The eccentric capacity it desired, maybe adjusted by the :provision oiua further .inner eccentric-sleeve vwithin the sleeve 1l.

4The rear oscillating axle i8 besides, is bearing eccentrically in ashaft, `sothat by `turning' said shaft by means off the wormwheel 20,worm 2l and Avhand-wheel 22 it can 'be .moved towards the front or rear,whereby the position of the grinding disc 6 is adjusted in respect of4the workpiece.

The shaft-.19 at 'its one end is provided with a thread on which v"islaterallydisposed a nut l24 having `on its `outer circumference milledwormfteeth 25.4 By turning the handwvheel 26,V 'shaft 27, worm 28 andworm-wheel nut 25,'th`e shaft 19 isfshifted andwill take along therocking member 3 vand thus cause the advance of 'the grinding 'tworocking Ymembers shows the following advantages rThe direct reception ot'the workinglpressure by the upper rocking member; an

` almost straight oscillating movement of the grinding disc and therebya gradual change ot stroke by means or eccentrics, and direct belt driveof the grinding-spindle, while tension rollers of any sort or similardevices are dispensed with.

Further, the provision of heavy liying masses is avoided, whose momentumtorce would injuriously act upon the mechanism atv the end of eachstroke, in that the upper rocking member does not take part in thestroke, but only executes at the front bearing a Vslight up and downwardmovement,

while the rear swinging axle remains stationary,l and in 'that the driveor' the lower rocking member 3 is directly arranged on the grindingspindie 5.

Figs. 6, 7 and 8 show the grinding machine adapted for carrying out thehollow grinding or making the groove in steel wor'x ing-tools. j

The tool, in the present case a working steel, is first fixed in theradius head 3l and the flat cutting faces are ground bythe front ace ofthe grinding body 32 in the manner described above. Then the piece issecured in the holder and the groove cut by means of the profile disc34. ln the case or' largetools the groove may be obtained by means of'the` outsideproile or' the grinding body 32. For that purpose theprofile disc'ismoved over the said holder 33 by manipulating thehand-wheel 22 (Fig. 3) and itwill swing around this centerA positionduring the grinding operation. As the oscillating movementis only slightand the rocking arm large in proportion, the height of are will beexceedingly small, so that the grinding may be described as practicallystraight. The adjustment` is effected by raising the holder 33 by meansof a handwheel, bevel wheels 36l and spindle 38.

. The proiile disc 34 is either arranged inside the grinding body 32(Fig. 7 or at the opposite end of the grinding spindle (Fig. 8) or inany, other suitable manner adjacent to the grinding body 32.

The holder 33 is arranged `correspondingly at the left or right side ofthe frame and it may be swung out, when out et use,

and locked inposition by means of a handle 37 in order toobtain morespace available for the other grinding work.

Fig. 9 represents thedividing head tor the grinding machine, in' which 1is the frame and 32 the grinding-disc. The radius head is provided atits ybase with yscale 46, which latter is adjustable below an indicatingdevice 47 on the bed-plate 44. The screw 48 serves for locking in thedesired position. rllhe .gripping sleeve A Vfor the work-pieces isbearing in an eccentrical boring of a second sleeve 49 infsuch a manner,that by turning the latter, the

the

swinging oit the work-piece 55 in an upward or downwarddirectioni'sprendered possible. The grioping sleeve 50 is provided atits outside with `a hand-wheel 5l for turning and the eccentrical sleeve49 is provided with a handle 53 for the purpose of adjustment. 52 is anindicating pin. For centering the work-piece 55 centering jaws 54 areprovided, keeping it in proper position. v-

1 claim:

l. ln a grinding machine, a rocking kmember and agrinding spindlecarried thereby, an eccentric loosely mounted on the spindle, drivingmeans for the spindle and the eccentric, and meansto oscillate themember coniiprising an arm one end `of which surrounds the eccentric,and the other has a relatively fixed pivoting axis.

2. Agrinding machine according tofclaini l, in whichthe pivoting axisoi' the said arm is eccentrically adjustable for varying. the extent ofoscillation ofi-the rocking member.

3. ln a grinding machine, a driving shaft, a member mounted to swingupon the shaft, grinding spindle carriedbyV the -member at a distancefrom but operated by the shaft, an eccentric at the outer endy of theswing ing member, an arm having one end in which leccentric is carried,an adjustable pivot Jfor the other end of the arm, and a drivingconnection between the shaft andthe eccentricgfor oscillating thespindle end of the swinging member. .Y

4. In a grindingmaohine, a driving shaft and a member mounted to swingthereon, a

grinding spindle carried by the member at a distance :from the shaft, anarm having one end around the spindle and pivoted aboutthe other end, aneccentrical connection between the member and the arm to swing thespindle relatively thereto,tmeans for ,varying the pivotal connection ofthe arm to change the throw of the spindle, and means to shift the armlengthwise of its axis carrying the swinging membertherewith foradvancing and withdrawing the spindle.

In testimony that l claim the foregoing as my invention, l have signedmy name.

CHRISTOFFER MNTHE.

